6.10 control cables

Question 1

what are the advantages of control cables

Answer 1

strong
lightweight
flexible
high mechanical efficiency
can be set up without backlash

Question 2

what are the disadvantages of cables

Answer 2

tension must be adjusted regularly
prone to wear at points of contact
tension varies with temperature changes

Question 3

what is a strand

Answer 3

multiple wires are braided together to form a strand

Question 4

what is a cable

Answer 4

number of strands are braided together to form a cable

Question 5

what is regular lay

Answer 5

opposite direction twist

Question 6

what is lang lay

Answer 6

twisted strands around a central core

Question 7

what control cables do most aircraft have

Answer 7

right regular lay

Question 8

what is 1x7 cable

Answer 8

non flexible

Question 9

what is 1x19 cable

Answer 9

non flexible

Question 10

what is 7x7 cable

Answer 10

flexible

Question 11

what is 7x19 cable

Answer 11

extra flexible

Question 12

what does 1x7 mean

Answer 12

one strand compromised of 7 individual wires

Question 13

where are flexible cables used

Answer 13

straight runs
or
where large pulleys being used

Question 14

where is extra flexible cable being used

Answer 14

commonly used for flight controls and trim systems
small diameter pulleys

Question 15

what type of fittings are terminal fittings

Answer 15

swaged type

Question 16

what are the ball terminals used to attach

Answer 16

cable to quadrants and special connections where space is limited

Question 17

what are lock clad cables

Answer 17

system that is produced by swaging aluminium alloy tubing onto galvanised or stainless aircraft cable

Question 18

what are lock clad cables used for

Answer 18

aircraft control cables

Question 19

what are the benefits of lock clad cables

Answer 19

stretch is reduced substantially
sag is virtually eliminated
allows lock clad to be sealed when routed through pressure bulkheads
stops abrasion
reduce vibration
coefficient of expansion is similar to aircraft structure

Question 20

what is a turnbuckle

Answer 20

mechanical screw consisting of 2 threaded terminals and a threaded barrel

Question 21

what is a turnbuckle used for

Answer 21

minor adjustments in length and tension

Question 22

how can you identify the end of the turnbuckle barrel with left hand thread

Answer 22

groove or knurl at that end of the barrel

Question 23

what is the purpose of pulleys

Answer 23

guide cables
change direction of cable movement

Question 24

do pulleys need to be lubricated

Answer 24

they are sealed, pre lubed
no need to lube it extra

Question 25

whats the purpose of fairleads

Answer 25

prevents cable touching structure

Question 26

what are push rods made of

Answer 26

steel or aluminium

Question 27

what prevents rod end from loosening on a push rod

Answer 27

checknut

Question 28

what are bellcranks

Answer 28

used to change direction of travel in pushrods and increase mechanical advantage

Question 29

what are bellcranks usually made of q

Answer 29

heat treated aluminium

Question 30

when is a torque tube needed

Answer 30

when an angular or twisting motion is required

Question 31

what are the 2 most common flexible control system

Answer 31

bowden cables teleflex cables

Question 32

what is a bowden cable

Answer 32

inner steel cable which is free to slide in an outer housing

Question 33

what bowden cable outer housing usually made of

Answer 33

heavy guage helical steel wire

Question 34

what aircraft type use bowden cable

Answer 34

small light aircraft use it for throttle or fuel mixture

Question 35

what can cause bowden cables to fail

Answer 35

water or contaminants in the housing

Question 36

where is a common failure point on bowden cables

Answer 36

where the housing enters the barrel adjuster

Question 37

what aircraft use teleflex

Answer 37

modern day aircraft

Question 38

what does teleflex cable control

Answer 38

engine propeller trim fuel valvees

Question 39

what forces does teleflex transmit

Answer 39

push and pull

Question 40

what is rhe rotary travel of a single entry unit limited to

Answer 40

270 degrees

Question 41

what are sliding end units used for

Answer 41

converting push pull movement into a rotary movement